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Physicochemical control of foam properties
Current Opinion in Colloid & Interface Science ( IF 7.9 ) Pub Date : 2020-08-15 , DOI: 10.1016/j.cocis.2020.08.001
Nikolai Denkov , Slavka Tcholakova , Nadya Politova-Brinkova

This review summarizes our recent understanding on how various essential foam properties could be controlled (viz. modified in a desired way) using appropriate surfactants, polymers, particles and their mixtures as foaming agents. In particular, we consider the effects of these agents on the foaminess of solutions and suspensions (foam volume and bubble size after foaming); foam stability to liquid drainage, bubble coalescence and bubble Ostwald ripening; foam rheological properties; and bubble size in sheared foams. We discuss multiple, often non-trivial links between these foam properties and, on this basis, we summarize the mechanisms which allow one to use appropriate foaming agents for controlling these properties. The specific roles of the surface adsorption layers and of the bulk properties of the foaming solutions are clearly separated. Multiple examples are given and some open questions are discussed. Where appropriate, similarities with the emulsions are noticed.



中文翻译:

泡沫特性的物理化学控制

这篇综述总结了我们最近的理解,即如何使用适当的表面活性剂,聚合物,颗粒及其混合物作为发泡剂来控制(必要地改变)各种基本的泡沫性能。特别是,我们考虑了这些试剂对溶液和悬浮液起泡性的影响(起泡后的泡沫体积和气泡大小)。泡沫对排液,泡沫聚结和泡沫奥斯特瓦尔德熟化具有稳定性;泡沫流变性能;泡沫中的气泡大小。我们讨论了这些泡沫性能之间的多个通常不重要的联系,在此基础上,我们总结了允许人们使用适当的发泡剂来控制这些性能的机理。表面吸附层的特定作用和发泡溶液的整体性质被明确分开。给出了多个示例,并讨论了一些未解决的问题。在适当的地方,注意到与乳液的相似性。

更新日期:2020-08-15
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